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2018.01 / g

8

Electric Power Generation

Installation and maintenance

R150

AVRs

5384 en -

7 - TROUBLESHOOTING CHART

Symptom

Cause

Action

No voltage

build-up

Fuse blown

Check and replace

Low residual voltage across U 

and N terminals

If the generator’s residual voltage at rated speed 

is less than 2.5 VAC (L-N), disconnect the AVR 

and connect a 24 VDC battery, keeping F1 as 

positive and F2 as negative.

Connecting a freewheel diode (BY 127) across 

the field with the diode cathode to F1 and the 

anode to F2 during field flashing will help restore 

the residual voltage.

WARNING:

Remove the diode (BY-127) after field flashing.
The 24 V battery positive terminal must only be 

connected to F1 and the negative to F2.
Swapping the connection will cause diode BY127 

to explode instantly.

Incorrect wiring

Check wiring

Rotating diodes and/or fuse 

failed

Check and replace

Voltmeter on the front 

defective

Check and correct

AVR defective

(repeated fuse blowing)

Replace after performing a static test

Earthed exciter field

Check and correct

High voltage

build-up

Loose or missing connection 

to AVR U terminal

Check and correct

AVR defective

Perform a static test and replace if necessary

Low voltage

build-up

Low prime mover speed

Check and correct

Sensing loss in circuit

Check and correct

AVR defective

Replace the AVR

Voltage oscillation

Incorrect stability 

potentiometer sealing

Turn clockwise until hunting stops

Prime mover speed hunting

Check and adjust the controller

Load hunting, fluctuates 

rapidly

Check and correct

High percentage of non-linear 

loads

Check and reduce the non-linear load

High reactance in generator 

(during non-linear loading)

Consult the generator manufacturer

Incorrect 

regulation

The exciter field’s requirement 

is higher than 105 VDC

Wrong selection or very low P.F. load. Check and 

correct.

Prime mover speed drops too 

much when on load (kW load)

Adjust the controller and reduce the active load

Содержание LEROY-SOMER R120

Страница 1: ...R2 Droop 50 Hz V AC S UF OE SL UF OE 60 Hz R1 A1 A2 Q2 Q1 F2 F1 N FUSE W V R150 R150 AVRs Installation and maintenance...

Страница 2: ...rning symbol for electrical danger to personnel All servicing or repair operations performed on the AVR should be undertaken by personnel trained in the commissioning servicing and main tenance of ele...

Страница 3: ...IN FUNCTION OF THE AVR 6 5 AVR SETTINGS 7 5 1 V TRIM V 7 5 2 FRO UF 7 5 3 STAB S 7 5 4 EXC LIMIT OE 7 5 5 QUADRATURE DROOP 7 5 6 A1 A2 DC VOLTAGE INPUTS AC 7 6 AVR CONTROLS 7 7 TROUBLESHOOTING CHART 8...

Страница 4: ...circuit continuously monitors the generator underspeed protection by reducing the generator output voltage in proportion with the speed below a threshold The AVR has the facility for droop CT connecti...

Страница 5: ...ge regulation 0 8 at the AVR terminals 14 Thermal drift 1 for a 30 C change in temperature 15 Response time less than 50 ms 16 Closed loop response typically 0 5 sec to recover 98 of the defined volta...

Страница 6: ...sects the amplified voltage at a point which is early or late in the half cycle At this intersection point a starting pulse is produced to trigger the power device Only qualified personnel should repl...

Страница 7: ...r clockwise will result in a sluggish response and possibly also oscillations The factory default setting is slightly higher than critical damping around halfway 5 4 EXC LIMIT OE This function is prov...

Страница 8: ...oltmeter on the front defective Check and correct AVR defective repeated fuse blowing Replace after performing a static test Earthed exciter field Check and correct High voltage build up Loose or miss...

Страница 9: ...hould be approximately 2 2 MW in the 10 MW range and vice versa with the multimeter jack common applied to the AVR F2 terminal should be 15 MW ZERO indicates power device failure in both cases Nofurth...

Страница 10: ...ockwise the lamp should go out slowly Now turn the UF potentiometer clockwise The lamp should glow brightly again 5 It is difficult to prescribe a static test for checking the stability as this is mor...

Страница 11: ...1 g 11 Electric Power Generation 135 mm 115 mm 110 mm 90 mm 10 10 R2 Droop 50 Hz V AC S UF OE SL UF OE 60 Hz R1 A1 A2 Q2 Q1 F2 F1 N FUSE W V R150 Installation and maintenance R150 AVRs 5384 en 10 DIME...

Страница 12: ...ion you may require For all spare parts orders or technical support requests send your request to service epg leroy somer com or your closest contact whom you will find at www lrsm co support indicati...

Страница 13: ...ith local legislation regarding product disposal and recycling Waste hazardous materials The following components and materials require special treatment and must be separated from the alternator befo...

Страница 14: ...2018 01 g 14 Electric Power Generation Installation and maintenance R150 AVRs 5384 en...

Страница 15: ...ent repair support and maintenance services Trust your alternator maintenance and support to electric power generation experts Our field personnel are 100 qualified and fully trained to operate in all...

Страница 16: ...2018 01 g www leroy somer com epg 5384 en Linkedin com company Leroy Somer Twitter com Leroy_Somer_en Facebook com LeroySomer Nidec en YouTube com LeroySomerOfficiel...

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